diff --git a/tests/omni_lock_rust/tests/misc.rs b/tests/omni_lock_rust/tests/misc.rs
index 19f1299..067fa47 100644
--- a/tests/omni_lock_rust/tests/misc.rs
+++ b/tests/omni_lock_rust/tests/misc.rs
@@ -623,7 +623,7 @@ pub fn sign_tx_by_input_group(
     let mut preimage_hash: Bytes = Default::default();
 
     let message = if config.cobuild_enabled {
-        cobuild_generate_signing_message_hash(&config.cobuild_message, dummy, &tx)
+        cobuild_generate_signing_message_hash(&Some(config.cobuild_message.clone()), dummy, &tx)
     } else {
         let mut blake2b = ckb_hash::new_blake2b();
         let mut message = [0u8; 32];